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Mathieu Dupuy a463449e35 csv: support non-ASCII Unicode dialect characters (#9367)
* scripts: make check_redundant_patches.py executable

The redundant-test-patches pre-commit hook uses `language: script`, which
requires the executable bit, and fails on every commit touching Lib/test.

Assisted-by: Claude:claude-sonnet-5-5

* csv: support non-ASCII Unicode dialect characters

Store delimiter, quotechar and escapechar as `char` instead of `u8`, and
run the reader state machine and the writer over code points, so that a
single non-ASCII character such as `€` is accepted like in CPython. The
field size limit is now counted in characters rather than bytes.

Fixes #8408

Assisted-by: Claude:claude-sonnet-5-5
2026-10-28 01:23:02 +09:00
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